Just from the looks of him in the photo, I'd say he's in better shape than most 84 year olds. I know some 60 year olds that ought to have their licenses taken away (quite a few 30 somethings as well!), and also know a couple of 90 year olds that I'd trust driving all day. It all depends on the individual.
The Model A was a bit over-built by today's standards. But they do have their quirks that keep their owners on their toes. I had a neighbor who was a mechanic from way, way back, and one of the few who still had some of the specialized tools for working on the Model A. All kinds of them were going in & out of his garage, mostly for the things the owners couldn't do on their own. That's the thing with driving an old car; you learn pretty quickly what it takes to keep it running, and get to know the thing pretty well.
He is far ahead of the game in insurance and repairs with not having new car payments, easily. I drive a vintage car and have no monthly payments at all, parts are a bit expensive when I need them, but new cars need repairs as well. Hats off, wonderful story, may he keep the car running a long time yet. Also, I love the fact that he drives it, its a car, not a museum
The Model A was a bit over-built by today's standards. But they do have their quirks that keep their owners on their toes. I had a neighbor who was a mechanic from way, way back, and one of the few who still had some of the specialized tools for working on the Model A. All kinds of them were going in & out of his garage, mostly for the things the owners couldn't do on their own. That's the thing with driving an old car; you learn pretty quickly what it takes to keep it running, and get to know the thing pretty well.